Because she's an indie queen. They're pushing her to be the next big indie bitch. It's not an ATRL thing, it's an Internet thing. She's very e-famous.
Her music is very brooding and sometimes it makes people think about things. IDK. She creeps me out a bit with her plastic appearance and super-wallflower personality, but she's kind of captivating.
Her voice is haunting, and as the result it can carry the tracks.
Not to mention some of her more upbeat tracks **** on almost everything on the radio atm.